In this developed-for-ABC special that has already been foisted upon wee Coco fans (and their ‘rents) as a Pixar “short,” Olaf (voiced by Josh Gad) sets out to create new holiday traditions for Anna (Kristen Bell) and Elsa (Idina Menzel). (Disney’s Prep and Landing follows at 8:30.)

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CBS

The Big Bang Theory

Fall finale: Sheldon and Howard plan birthday parties for Amy and Halley; Leonard stresses over his lack of accomplishments after receiving a Christmas letter from his brother.